Suicide bomber was killed and two other people wounded in a blast near the U.S. consulate in Jeddah, Saudi Arabia

Suicide bombers struck three cities across Saudi Arabia on Monday, in an apparently coordinated campaign of attacks as Saudis prepared to break their fast on the penultimate day of the holy month of Ramadan.

The explosions targeting U.S. diplomats, Shi'ite worshippers and a security headquarters at a mosque in the holy city of Medina follow days of mass killings claimed by the Islamic State group, in Turkey, Bangladesh and Iraq. The attacks all seem to have been timed to coincide with the approach of Eid al-Fitr, the holiday that celebrates the end of the fast.

A Saudi security official said an attacker parked a car near the U.S. consulate in Jeddah before detonating the device. The official said the government was checking the reports of blasts in Qatif and Medina.

In the only one of the three attacks that appeared to have caused many casualties, a suicide bomber detonated a bomb near the security headquarters of the Prophet's Mosque in Medina, the second-holiest site in Islam.